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Image sensor

  • US 6,690,000 B1
  • Filed: 12/01/1999
  • Issued: 02/10/2004
  • Est. Priority Date: 12/02/1998
  • Status: Expired due to Term
First Claim
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1. An image sensor having a pixel circuit which comprises:

  • a light-receiving element for generating a photo-electric conversion voltage which corresponds to an input optical level, a first transistor disposed between said power supply and said light-receiving element, which is activated in response to a Reset signal, to initialize said light-receiving element from a power supply, a second transistor connected between said power supply and a third transistor, which responsive to a control signal from the light-receiving element, amplifies said photo-electric conversion voltage and outputs said voltage onto third transistor source region, and the third transistor disposed between said second transistor and a bit line, which is activated by a word-line readout control signal, to interconnect said second transistor and said bit line, wherein said first transistor is a depletion-type transistor and said second transistor is an enhancement type transistor.

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